The FBI is not expected to pursue any charges against former national security adviser Michael Flynn regarding a phone call with Russia's ambassador, barring new information that changes what they know, law enforcement officials told CNN Thursday.

Flynn was fired by President Donald Trump earlier this week after it was revealed that he withheld information from Vice President Mike Pence about his conversations with Sergey Kislyak, Russia's ambassador to the US.

Although Flynn didn't remember all of what he talked about, they don't believe he was intentionally misleading them, the officials say.

Further, then-acting Attorney General Sally Yates delayed notifying the White House until after Flynn was interviewed. At that point, FBI Director James Comey did not object to notifying the White House counsel. There is still an ongoing, broader FBI review of Flynn and Russia-related dealings.